I'm not aware of any summer dormant geraniums and maculatum varieties are summer flowering. Maybe it needs more shade but it also needs good moisture. Does it get dry there? Even now, I would move some soil away from the base and make a recess and fill with water. Do,it few times to saturate the soil and then mulch

I mention shade mainly because of the moisture factor. I think water is the issue butterflybrain. Why has everyone got brilliant,forum "handles"? If I thought about it properly I. Could have chosen something more inspiring!